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Chevrolet Impala (fifth generation)

first generation)
1974 Chevrolet (10754212153).jpg
1974 Chevrolet Impala Sport Sedan
Overview
Manufacturer Chevrolet (General Motors)
Production 1970–1976
Model years 1971–1976
Assembly Arlington, Texas
Oshawa, Ontario
Janesville, Wisconsin
Tarrytown, New York
Body and chassis
Body style 2-door convertible
2-door Sport Coupe (hardtop)
2-door Custom Coupe (formal hardtop)
4-door hardtop
4-door sedan
4-door station wagon
Layout FR layout
Platform B-body
Related Chevrolet Caprice
Chevrolet Bel Air
Powertrain
Engine 250 cu in (4.1 L) 250 Inline Six
350 cu in (5.7 L) Turbo Fire V8
400 cu in (6.6 L) Turbo Fire V8
402 cu in (6.6 L) Turbo-Jet 400 V8
454 cu in (7.4 L) Turbo-Jet V8
Transmission 3-speed manual (standard, 1971–1972 on all six-cylinder cars)
3-speed Turbo-Hydramatic automatic (optional 1971–1972 on six-cylinder cars; standard on V-8 powered cars from mid-1971 onwards)
2-speed Powerglide automatic (optional on 1971–1972 six-cylinder and small-block V8 engines)
Dimensions
Wheelbase 121.5 in (3,086 mm)
Length 222.0 in (5,639 mm)

The fifth-generation Chevrolet Impala were full-sized automobiles produced by Chevrolet for the 1971 through 1976 model years and was one of GM's top-selling models throughout the 1970s. Models included a sport coupe using a semi-fastback roofline shared with other B-body GM cars, custom coupe with the formal roofline from the Caprice, four-door sedan, four-door hardtop sport sedan, and a convertible, - each of which rode on a new 121.5-inch wheelbase and measured 217 inches overall. Station wagons rode on a longer 125-inch wheelbase.

The 1971 redesigned B-body would be the largest car ever offered by Chevrolet. All 1971 Chevrolet engines featured lower compression ratios to permit the use of regular leaded, low lead or unleaded gasoline of at least 91 Research octane per GM corporate mandate in anticipation of the catalytic converters planned for 1975 and later models which necessitated the use of unleaded fuel. A high-performance big block V8 was available in the form of the Turbo-Jet 454, which produced 365 hp in 1971, but power decreased as the years went along. The 1970s marked the impact of the 1973 energy crisis with gasoline prices doubling from 1973 through 1979 and industry car sales plummeted 20 percent between 1973 and 1974. For the first time in recent history, annual passenger car travel in the U.S. declined. The Impala's sales dropped to 176,376 units in 1975, the weakest since its introduction in 1958. An Econominder gauge package was offered for 1975 and 1976 models.

1971 models offered the same lineup as previous years including New standard features included power front disc brakes and inside hood release and a revised Astro Ventilation system that utilized air distribution grills in the trunklid. The new body featured a double panel roof for improved rollover protection and flush exterior door handles - both features previously introduced on the 1970½ Camaro.

Engine offerings included the base 145-horsepower, 250 cubic-inch Turbo Thrift six-cylinder (available only on the Impala four-door sedan as well as the lower-line Biscayne and Bel Air sedans) and 245-horsepower 350 cubic-inch Turbo Fire V-8 (standard on Impala Sport Sedan, Sport Coupe, Custom Coupe, convertible and Kingswood wagon, and optional on the sedan). Optional engines included the 255-horsepower 400 cubic-inch Turbo Fire V-8 (the standard Caprice and Kingswood Estate engine), 300-horsepower 400 cubic-inch Turbo Jet V8 and 365-horsepower 454 cubic-inch V-8. Early in the model year, all Impalas came standard with three-speed column shift manual transmissions and manual steering as standard equipment, with power steering and one of two automatic transmissions optional. During the first months of the model year, the three-speed Turbo-Hydramatic automatic transmission was optional with all engines while the two-speed Powerglide could be ordered with the 250 6 or 350 V-8s. At mid-year the Turbo-Hydramatic and variable-ratio power steering became standard equipment on all V-8 powered full-sized Chevrolets.


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